“What do you mean?” asked the young detective, and his words, as well as those of the chief inside the cabin came plainly to his listeners.

“I mean the key just plopped into the ashes and stayed there.”

“Didn’t it bounce out at all?”

“Nary a bounce.”

“Well, then we’ll try it again.”

Which they did—a dozen times or more—but always with the same result. The key fell down the flue with many a tinkle as it struck the cross pieces of iron bars which Hiram had set in to prevent night-prowling animals from entering his strong room. Then the brass implement fell into the soft ashes where it remained.

“Well, that settles one point,” declared Ned, as they all went inside the cabin after the test. “The man who robbed Mr. Beegle and locked him inside the room, putting the key back in after he went out, didn’t use the chimney.”

“That’s right!” chimed in Harry.

“And yet what other opening is there by which the key could have been gotten back in this room, and placed close to the hand of Mr. Beegle, so it would look as if he had locked himself in, robbed himself and made himself unconscious with chloroform or something?” asked Ned. “What other opening is there?”

“None!” declared Chief Drayton. “I went all over that Hiram made his room as tight as a bank vault. The fireplace is the only opening in or out, and the key didn’t come down there!”